| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 11m 49.0763s[1] |
| Declination | +22° 49′ 32.686″[1] |
| Apparent magnitude (V) | 11.51 |
| Astrometry | |
| Proper motion (μ) | RA: -0.067[1] mas/yr Dec.: -1.889[1] mas/yr |
| Parallax (π) | 0.4403 ± 0.0856 mas[1] |
| Distance | approx. 7,000 ly (approx. 2,300 pc) |
| Orbit[2] | |
| Period (P) | 78.80±0.01 d |
| Eccentricity (e) | 0.0±0.01 |
| Semi-amplitude (K1) (primary) | 52.9±0.1 km/s |
| Semi-amplitude (K2) (secondary) | 11.2±1.0 km/s |
| Details[2] | |
| stripped helium star | |
| Mass | 1.5±0.4 M☉ |
| Luminosity | 630 L☉ |
| Surface gravity (log g) | 3.0±0.2 cgs |
| Temperature | 12700±500 K |
| Be star | |
| Mass | 7±2 M☉ |
| Luminosity | 1,260 L☉ |
| Surface gravity (log g) | 4.0±0.3 cgs |
| Temperature | 18000±2000 K |
| Database references | |
| SIMBAD | data |
LB-1 is a binary star system in the constellation Gemini. In 2019 a paper in Nature proposed the system contained an unusually massive stellar black hole outside of ordinary single stellar evolution parameters.[3] However, analyses in 2020 found the original 2019 conclusion to be incorrect. Some researchers now believe the system consists of a stripped B-type star and a massive rapidly rotating Be star.[2][4]
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c Cite error: The named reference
Shenar_etal_2020was invoked but never defined (see the help page). - ^ "Scientists have discovered a 'monster' black hole that's so big it shouldn't exist". CNN. 29 November 2019. Retrieved 31 December 2020.
- ^ "Scientists keep debunking 'monster black hole' discovery. So, what's the deal with binary system LB1?". Space.com. May 2020. Retrieved 31 December 2020.